Question

Farhan worked for 2 hours and then raju joined him. after 4 more hours, farhan stopped, and raju took another 20 hours to complete the remaining part of the job. if both of them work together they can complete the job in 18 hours. how many hours will farhan and raju take to complete the job if they work separately? 1 point

Answer 1

the answer is 18 + 18 =36hours

Answer 2

Answer:arhan can do in 27 hours and raju can do in 54 hours.

Step-by-step explanation:

let farhan can complete the work in x hours and raju can complete in y hours separately. unit work done by farhan is 1/x and by raju is 1/y

as given if both of them work together time taken to complete the job = 18 hours.

so 1/x +1/y =1/18 ---------1

as total working hour of farhan = 6 hours

total working of raju= 24 hours

so

$\frac{6}{x}+\frac{24}{y}=1\\\\\frac{1}{x}+\frac{4}{y}=\frac{1}{6}$

by solving this equation with 1st equation

y = 27 hours

and x=54 hours

so farhan can do in 27 hours and raju can do in 54 hours.